I love love love these cups! Because they're double-insulated, don't have to use a coaster when I'm drinking something iced, and I never have to worry about hot handles and burnt hands when I pass along a hot drink to my husband. I have noticed that my hot drinks stay hotter longer, which is awesome since I usually take my time drinking teas and coffees. They also make any drink look restaurant-elegant, which is something plastic and ceramic really can't pull off. I only have one of these right now, but if I had more, I'd totally donate all my tumblers and mugs, because these work better than both!